The Witness for the Dead by Katherine Addison

When the young half-goblin emperor Maia sought to learn who had killed his father and half-brothers, he turned to an obscure resident of his Court, a Prelate of Ulis and a Witness for the Dead. Thara Celehar found the truth, though it did him no good to discover it. He lost his place as a retainer of his cousin the former Empress, and made far too many enemies among the many factions vying for power in the new Court. The favor of the Emperor is a dangerous coin.

Now Celehar lives in the city of Amalo, far from the Court though not exactly in exile. He has not escaped from politics, but his position gives him the ability to serve the common people of the city, which is his preference. He lives modestly, but his decency and fundamental honesty will not permit him to live quietly. As a Witness for the Dead, he can, sometimes, speak to the recently dead: see the last thing they saw, know the last thought they had, experience the last thing they felt. it is his duty to use that ability to resolve disputes, to ascertain the intent of the dead, to find the killers of the murdered.

Celehar's skills now lead him out of the quiet and into a morass of treachery, murder, and injustice. No matter his own background with the imperial house, Celehar will stand with the commoners, and possibly find a light in the darkness.